Spherical osteotomy device and method
a spherical osteotomy and bone marrow technology, applied in the field of spherical osteotomy, can solve the problems of limited ability inability to use barrel-vault osteotomy to correct axial rotational deformation, and difficulty in alignment. , to achieve the effect of improving the stability and stability of the bone, and improving the ability to maintain the bon
Active Publication Date: 2009-03-19
SZANTO ZSIGMOND
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Benefits of technology
[0013]Accordingly, the invention presented herein accomplishes a substantially spherical or “true dome” shape when cutting bone, facilitating correction in three dimensions and aiding the healing process of the cut bones.
[0014]In embodiments of the invention, a “true dome” or spherical osteotomy device may be used to cut a bone into two substantially mating portions, allowing correction of the bone to be accomplished by rotating bone portions about their substantially mating surfaces, which may also allow correction for axial rotation without unnecessary secondary translation. Moreover, “true dome” osteotomy provides for three-dimensional adjustability of the bone while maximizing bone-to-bone surface contact and stability. Advantageously, procedures utilizing the spherical osteotomy device require less complex pre-operative planning and provide more accurate correction.
[0015]Embodiments of the invention provide several important advantages. Specifically, a “true dome” or spherical osteotomy device, including a method of using the spherical osteotomy device, may create dome shaped mating surfaces as opposed to semi-cylindrical cuts conventionally made, may provide for match of the proximal and distal fragments of the osteotomy, may optimize dome height, may minimize bone loss, may decrease the complexity of pre-operative planning, may allow the surgeon to make intraoperative adjustments to attain desired correction, may not unacceptably wedge or heat bone portions during cutting, may avoid unnecessary heat and burning, may minimize damage to bone tissue and the surrounding soft tissue, may avoid metal to metal contact of surgical instruments, and may aid faster and more reliable healing of the bone. Another advantage, a spherical osteotomy device may be self-guiding and self-centering within the cut being made in the bone, giving the surgeon options in planning the surgical approach around soft tissue structures.
[0016]In one embodiment of the invention, a spherical osteotomy device for the efficient surgical sectioning of bone is described that includes a partially spherical body and a shank. The part spherical body includes an outer surface, an inner surface, a cutting end between the outer surface and the inner surface, an axis that extends from the outer surface through the inner surface, and an origin located on the axis. The inner surface has a substantially constant radius extending from the origin. The shank extends outwardly from the outer surface of the body and is substantially aligned with the axis. Optionally, the spherical osteotomy device may be attached to an osteotome handle or to a power tool such as an oscillating saw. The spherical osteotomy may be used to cut bones or other anatomical structures into two portions in such a way as to facilitate repositioning of oppositely opposed substantially mating surfaces in the desired position or orientation, thereby also to aid healing.
[0017]The bone saw bit advantageously allows the bone portions after surgical severance to be repositioned together in at least one of three different degrees of motion, because the bone saw bit cuts a “true dome” osteotomy into each bone portion. One of the bone portions will have a convex surface that substantially mates with the other bone portion having a concave surface. Because the surfaces have mating contours, the bone portions relatively may be rotated about the longitudinal axis of the bone and tilted in either of two dimensions about the bone to achieve repositioning in three dimensions.
Problems solved by technology
In this respect, barrel-vault osteotomy cannot be used to correct axial rotations of the bone without creating gaps and instability between bone segments thereby being a major limitation of so called “barrel-vault” osteotomies.
The success of barrel-vault osteotomies relies heavily on meticulous pre-operative planning, and while it may be used to correct radial deformities in the frontal and sagittal planes, one of its major disadvantages is the limited ability to correct axial rotational deformities.
In addition to the general disadvantages of “barrel-vault” osteotomies mentioned above, such a method undesirably creates ridges between adjacent sets of drilled parallel holes making alignment more difficult and gaps between bone portions more probable.
While the cut resulting from the use of the biradial saw blade provides for a better match of the two surfaces of both bone portions, the heat and friction produced by the saw blade may be detrimental to the bone, specifically for allowing proper healing thereof.
Conventional blades are limited in providing semi-cylindrical cuts of the bone which limit the correction in the bone, particularly when correcting deformities that lie in two planes, such as the frontal and sagittal planes.
Another disadvantage associated with the use of so-called “barrel-vault” osteotomies is the limited ability to correct axial rotational deformities.
Correction of other deformities may also be difficult to make, particularly when a correction of the deformity requires cutting the bone in a less accessible location.
This makes it increasingly difficult for a surgeon to provide the corrective cut, as described above, where it is needed.
Another disadvantage of barrel-vault osteotomies is the bone portions, after severance, may only be repositioned with respect to one another about two principal dimensions, one of the principal dimensions being an angular displacement or rotation about the central axis, and the other principal dimension being a lateral displacement or position along the central axis.
Lateral displacement of the bone pieces is limited to the extent that the bone portions include sufficient surface contact for proper healing to occur.
Angular displacement of the bone pieces provides for better bone-to-bone contact than lateral displacement, however, angular displacement is still limited if the bone portions are to be maintained with sufficient surface contact in order to provide for proper healing.
Whereas the conventional device is advantageous for general ostectomies for shaping the end of a bone, it is impractical for precise osteotomy of a bone.
Such conventional devices undesirably require metal to metal contact between the cutting blade and the guide.
Moreover, this conventional device and method are not suitable for true dome osteotomies because, while it may create a curvilinear cut partially into the bone, the device would wedge itself between opposing bone portions during the cutting process due to the shape of the sectioning element or blade.
Furthermore, the conventional device may damage the bone by creating too much pressure and heat, caused by friction, during the cutting procedure.
Moreover, such conventional devices having a flat top on the upper end of the device restrict full cutting or sectioning of the bone into two portions, particularly when the flat top of the device reaches the parallel surface of the guide with respect to the axis of the bone that prevents complete cutting of the bone.
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[0056]The illustrations presented herein are, in some instances, not actual views of any particular osteotomy device, “true dome” osteotomy device, spherical osteotomy device, bone saw bit, cutting element, hard facing material or other feature of an osteotomy bit or device, but are merely idealized representations which are employed to describe the invention. Additionally, like elements and features among the various drawing figures are identified for convenience with the same or similar reference numerals.
[0057]“True dome” or spherical osteotomy devices, hereinafter “bone saw bits,” suitable for osteotomy or other surgical cutting of bone are presented. Bone saw bits for surgically severing bone are now presented together with some terminology to facilitate a proper understanding of the invention.
[0058]The term “spherical” as used herein means a characteristic of a sphere over any portion of a sphere and is not to be limited to a complete sphere, including, but not limited to, a h...
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A spherical osteotomy device for the efficient surgical sectioning of bone includes a part spherical body and a shank. The part spherical body includes an outer surface, an inner surface, a cutting end between the outer surface and the inner surface, an axis extending from the outer surface through the inner surface, and an origin on the axis. The inner surface has a substantially constant radius extending from the origin. The shank extends outwardly from the outer surface of the body and is substantially aligned with the axis. Other embodiments of an osteotomy device are described. Also provided is a method of using the osteotomy device for performing spherical osteotomies.
Description
RELATED APPLICATIONS[0001]This application claims the benefit under 35 USC §119(e) of U.S. Application 60 / 993,820 filed 13 Sep. 2007, which is hereby incorporated in its entirety by reference.FIELD OF INVENTION[0002]This invention relates generally to osteotomy devices for use in the surgical cutting of bones, and more specifically to spherical osteotomy devices for use in surgical division or sectioning of bones and a method therefore, particularly spherical osteotomy devices for use in performing “true dome” osteotomies.BACKGROUND[0003]Osteotomy is defined as a procedure for surgical division or sectioning of a bone. Displacement osteotomy is the surgical division of a bone and shifting of the divided ends to change the alignment of the bone or to alter weight-bearing stresses. This procedure is typically utilized by orthopedic surgeons to correct for malalignment and malorientation, including uniapical and multiapical deformities of the bone, as well as the treatment for compartm...
Claims
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IPC IPC(8): A61F5/00A61B17/00
CPCA61B17/1637
InventorSZANTO, ZSIGMOND
OwnerSZANTO ZSIGMOND